IPA: /ˌɪn.sɪˈnjuː.ɪŋ.li/
KK: /ɪnˈsɪnueɪtɪŋli/
In a way that suggests something bad or unpleasant without saying it directly.
She spoke insinuatingly, hinting that he might be lying.
Insinuatingly → It is formed from "insinuare" (from Latin, meaning to introduce or insert subtly) and the suffix "-ly" (meaning in a manner of). The word describes the manner of introducing something subtly or indirectly, often with a hint of suggestion.
Think of 'insinuate' as introducing something subtly, and the '-ly' means in that manner. So, insinuatingly means doing something in a subtle or suggestive way.